Strip locking means for abrading and polishing machines



July 15, 1947. J HlL'L QulsT 2,424,167

STRIP LOCKING MEANS FOR ABRADING AND POLISHING MACHINES Filed March 1,1946 M 3 \l ha l/I Patented July 15, 1947 UNITED STATES PATENT OFFICESTRIP LOCKING MEANS FOR ABRADING AND POLISHING MACHINES Karl J.Hillquist, Seattle, Wash.

Application March 1, 1946, Serial No. 651,354

2 Claims.

This invention relates to abrading devices, polishers and sanders andhas reference more particularly to improvements in devices of that kindwherein a flexible strip of abrasive material, such as sand paper, emerypaper or cloth, or other abrasive in flexible strip form, is appliedabout a rotatably driven drum to provide a polishing or abradingsurface; it being the principal object of this invention to provide asimplified and effective means for securing the abrasive strip about thedrum and for its quick and easy release for its removal.

More specifically stated, the object of the present invention is toprovide a locking device of a novel form whereby the end portions 'oftheabrasive strip may be securely clamped and held within a receiving slotthat is formed radially of the drum and open to the surface thereof toreceive the said end portions after the strip has been wrapped about thedrum.

A further object of the present invention resides in providing the drumwith a, radial slot to receive the end portions of the abrasive strip,and a releasable locking bolt mounted in the drum adjacent the slot andwhereby the ends of the abrasive strip, after being applied within theradial slot, may be securely clamped and held by the pressure of thethreads of the bolt thereagainst. Furthermore to so arrange the boltthat the threads secure the strip ends and also so engage them that inturning the bolt they will pull them into the slot and draw the striptaut about the drum.

Another obiect of the invention is to provide a locking device as aboverecited that provides for quick and easy locking and releasing of thestrip merely by a partial rotation of the bolt.

Still further objects and advantages of the invention reside in thedetails of construction and combination of parts employed therein and intheir mode of use as will hereinafter be fully described.

In accomplishing these and other objects of the invention, I haveprovided the improved details of construction, the preferred forms ofwhich are illustrated in the accompanying drawings, wherein Fig. 1 is aperspective view of the drum portion of an abrading machine embodyingtherein the improvements of the present invention.

Fig. 2 is an enlarged, sectional detail illustrating the bolt of thepresent locking device in position for the insertion of the end portionsof the abrasive strip into the drum slot preparatory to their beingsecured by the bolt.

Fig. 3 is a similar view showing the strip ends as applied to the slotand secured by the locking bolt.

Fig. 4 is a cross sectional view of that part of the drum containing theslot, as seen on line 4-4 in Fig. 2, a part being broken away for betterillustration.

Referring more in detail to the drawings- I!) designates what may be adrum of typical form as used in an abrading machine or polishing deviceand which may be mounted and rotatably driven by any suitable means, forexample, on a driven shaft and supported in a frame and driven by anelectric motor or otherwise; this not being important in so far as thepresent invention is concerned. Applied about the cylindrical outersurface of the drum in is a strip or band of abrasive material l2. Thismay be a strip of sand paper, emery paper or cloth or any other abrasivein strip form adapted to be used on a drum of this kind.

Formed across the rim portion of the drum and in a radial plane thereof,is a narrow and relatively deep slot or channel It that is designed toreceive therein the opposite end portions of the abrasive strip in anoverlapped relation after the strip has been wrapped about the drum asshown in Fig. 1. Adjacent the slot 13 is an internally threaded bore l5that extends through from face to face of the rim portion of the drum,parallel to the drum surface and opening along one side for its fulllength into the slot, as best shown in Figs. 2 and 3.

Contained in the bore is the present locking bolt I8, This bolt isthreaded into the bore and extends from end to end thereof as shown inFig. 4. Along one side, a segment of the bolt surface is cut awayparallel to the bolt aXis to form a fiat side surface as designated at2|) that extends from end to end of the bolt. When in place the bolt isso related to the slot that the flat surface may, by turning the bolt,be brought substantially into coincidence with the plane of the adjacentside surface of the slot l2 as has been shown in Fig. 2. Then, byrotation of the bolt through an angle of approximately ninety degrees,the rounded body of the bolt will extend into and partially close theslot as a means for securing the strip ends as has been shown in Fig. 3.

For the purpose of turning the bolt, it is formed across one end With achannel 25 designed to receive the end of a screw driver or other toolfor this purpose. Such slots might, if desired, be applied to both endsof the bolt.

Assuming the parts to be so constructed and assembled as described,their mode of use is as follows:

First the bolt is applied to the threaded bore and is turned to theposition in which it is shown in Fig. 2. Then the abrasive strip I2 iswrapped about the drum and its opposite end portions tucked down intothe slot 13 as shown in Fig. 1. The strip should be of sufficient lengththat the strip ends would extend below the bolt. Then the bolt isrotated through about a quarter turn, in the direction of the arrow inFig. 3, and in doing this the fiat ends of the threads along the topedge of the fiat surface of the bolt will be caused to engage againstthe strip ends and with the turning of the bolt, to pull them down intothe slot and clamp them tightly between thebolt and opposite sidesurface of the slot. Dimensions are such that this will tightly securethe strip. Thus the securing of the strip is easily, quickly andeffectively accomplished.

To release the strip for removal, it is only necessary to turn the boltback to its starting position shown in Fig. 2.

Looks of this kind are applicable to machines ,7

of various kinds and in various sizes and are not applied for use andhaving a slot formed therein across the drum surface to receive theopposite end portions of an applied strip in juxtaposed relationshiptherein, a bore in the drum parallel with and opening into the slotalong one side thereof, a threaded bolt mounted in said bore and havinga flat surface formed along one side thereof adapted by turning the boltin the bore to be brought into the plane of the adjacent side Wall ofthe slot for passage of the end portions of the strip; said bolt havinga longitudinal edge portion bounding the flat surface thereof that maybe caused, by rotative adjustment of the bolt, to move into the slotagainst the juxtaposed end portions of the strip to clamp them againstthe opposite wall of the slot.

2. A strip locking means as recited in claim 1 wherein the bolt isthreaded into the bore, and wherein its threads form sharp teeth alongthe longitudinal edges of the flat surface portion thereof, that willengage with and clamp the strip ends against the slot wall when the boltis rotated to the clamping position.

KARL J. HIILQUIST.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 220,993 Seel'ye Oct. 28, 1879247,140 Wilhelm Sept. 13, 1881 603,357' Bagley May 3, 1898 1,757,679Myers May 6, 1930 1,836,367 Emmons Dec. 15, 1931 1,975,630 BoettcherOct. 2, 1934 2,344,550 Knowlton Mar. 21, 194%

